Hey Kelly,
Welcome and thanks for sharing your questions here with the community.
Generally, when getting *4xx* and *5xx* responses from your App Engine
application, I would suggest looking for related request logs in Stackdriver
Logging <https://cloud.google.com/logging/docs/quickstart-sdk#explore> which
you seem to have done. The log you've pasted in your initial message
suggests the application is consuming more memory than releasing.

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- What runtime are you using?
- You mention that the application is processing Google Drive files.
How large are these files?
- Can you point to the APIs and client libraries the application uses to
handle the files? I ask as it's possible the files are too large to be
processed entirely at once.
- Do you still get this same error if using instances with greater
memory?
- Are you using the standard environment or flexible environment?
On Thursday, October 13, 2016 at 12:05:56 AM UTC-4, Kelly Ingram wrote:
>
> I have a cron job setup to run every 20 minutes which has been running as
> expected until 2 days ago where I am now getting intermittent failures and
> GAE is returning a status of 500 with the WARNING message:
> While handling this request, the process that handled this request was
> found to be using too much memory and was terminated. This is likely to
> cause a new process to be used for the next request to your application. If
> you see this message frequently, you may have a memory leak in your
> application.
>
> and sometimes includes the INFO message:
> This request caused a new process to be started for your application, and
> thus caused your application code to be loaded for the first time. This
> request may thus take longer and use more CPU than a typical request for
> your application.
>
> It will run ok once or twice and then randomly it won't run and returns
> the above messages.
> Nothing is changing in the code or the files it's processing on Google
> Drive so I am confused as to what could be the issue.
>
> I've also occasionally received a status of 404 over the past few days.
> Again with no obvious reason why.
>
> Anyone else receiving these errors?
>
> Thanks
>
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